Screw-driver.



. of Kansas,

S'JREW-DRUFErR.

Specification of Letters Patent.

Patented Aug. 18, 1eos.

Application filed August 8, 1907. Serial No. 387,695.

To all whom it may concern:

Be it known that I, HARRY O. HARRISON, a citizen of the United States, residing at Wichita, in the county of Sedgwick and State have invented a new and useful Screw-Driver, of which the following is a specification.

This invention relates to screw drivers.-

The object of the invention is to provide a screw driver having a novel form of screw holder combined therewith whereby to adapt the implement for use in ositions where an ordinary screw driver cou d not be used, the implement serve of itself positively to retain the screw holding attachment in any adjusted osition, and without the em loyment of c amping screws or the like such as are ordinarily em ployed.

A further object is to provide a novel form of screw-holding attachmentfor screw drivers which'may readily be adapted for use in connection with a'screw driver having either a olygonal or cylindrical shank.

With the above and other obj cots in view as will appear as the nature of the invention is better understood, the same consists in the novel construction of a screw driver and a screw-holding attachment therefor, as will be hereinafterfully described and claimed.

In the accompanying drawings forming a part of this specification, and in which like characters of reference indicate corresponding parts,-Figu'.' c 1 is a view in side elevation of one formof screw driver embodying the features of the resent invention. Fig. 2 is a fragmentary retail view of a portion of the screw driver shown in Fig. 1. Fig. 3 isa perspective detail view of the screw-holding attachment shown in Fig. 1. Fig. 4 is a perspective view, partly in section showing a slightly modified form of screw driver shank and. screw-hblding attachnmnt.

Referring to the drawings and to F igs., 1, 2 and 3 thereof, 1 designates the shank of a screw driver and 2 the handle thereof, the latter being of any preferred shape and being centrally pierced by the shank.

T he shank is quadrangular in cross sectionand is provided on one of its faces with teeth 3 that are adapted to be engaged. by a double acting detent 4 carried by the screw-holding attachment designated, generally, 5. This attachment is preferably made from a piece of resilient sheet metal, and is formed with being so constructed that it will and have their terminals inturned and trans versely dished, asat the shank of a screw adjacent to its head. The arms 6 merge into a sleeve 8 that is rectangular in. cross section to conform to the shapeof the shank of the screw driver, and has two of its walls, 9 and 10, formed b continuations of the arms, the third we 1, 11, being formed by bending the arms to the position shown, and, the fourth wall, which constitutes the detent 4, formed by bending a length of the metal parallel with the wall 11. The terminals 12- of the detent are downturned, in order to engage with the teeth 8, and thus'firmly hold the attachment in position, and to secure this result, the detent is separated for a short portion of itslength at both ends from the wall 10 and wholly disconnected from the wall 9, as clearly shown in Fig. 3.

In the form. of the invention shown in Fig. 4, the only difference is that the shank 13 is cylindrical in cross section and one side is provided with teeth l tthat are engaged by a detent 15 carried by a sleeve 16, which latter is cylindrical in cross section in order to conform to the shape of the shank.

It will be noted by reference to Fig. 1 that the teeth 3 extend from a point adjacent'to the outer end of the shank to the handle, the object of this arrangement being to permit of the entire length of the shank being utilized. as, when it wears down or becomes broken, it may be reground or dressed down to form a screw-engaging point, and thismay be continued until the shank, is only slightly longer than the attachment.

Owing to the fact that the screw-holding attachment may be slid freely upon the shank it will not be necessary to remove it should. the screw driver be used in the ordinary manuer; but should it be dcsired to' attach it this may readily be accomplished. in using the implement with the improve ments herein described the arms6 are flexed laterally, the point of the screw driver is brought into the nick of the screw and the attachment is then slid. rcarwardly to cause the terminals 7 to engage with To detach the screw driver from the screw it will only be necessary to draw upward or backward as the case maybe.

The improvements herein dcliucd are simple in character but will be found 7, in order to fit around the head.

arms 6 that are slightly outwardly bowed I A- screw holding attachriient for screw drivers comprising a sleeve two w'a'lls of which are extended to provide screw en'gaging arms, the terminalsgpf which are inturned and transversely dished, and a third wall wholly disconnected from the prcxi- {mate Wall along one edge and partly disconnected therefrom along the other edge to provide a double ecting detent.

' In testimony that I claim the foregoing sis yown, I have hereto affixed my signature 1-3 of two witnesses. "HARRY O. HARRISON Witnesses: 1 WM. C. HERSHBERGER,

H. H. CARR.

in the presence 

